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The possible role of Coriolis forces in structuring large-scale sinuous patterns of submarine channel-levee systems

Citation

Wells, M and Cossu, R, The possible role of Coriolis forces in structuring large-scale sinuous patterns of submarine channel-levee systems, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 371, (2004) pp. 1-19. ISSN 1364-503X (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The Authors

DOI: doi:10.1098/rsta.2012.0366

Abstract

Submarine channel-levee systems are among the largest sedimentary structures on the ocean floor. These channels have a sinuous pattern and are the main conduits for turbidity currents to transport sediment to the deep ocean. Recent observations have shown that their sinuosity decreases strongly with latitude, with high-latitude channels being much straighter than similar channels near the Equator. One possible explanation is that Coriolis forces laterally deflect turbidity currents so that at high Northern latitudes both the density interface and the downstream velocity maximum are deflected to the right-hand side of the channel (looking downstream). The shift in the velocity field can change the locations of erosion and deposition and introduce an asymmetry between left- and right-turning bends. The importance of Coriolis forces is defined by two Rossby numbers, RoW =U/Wf and RoR =U/Rf, where U is the mean downstream velocity, W is the width of the channel, R is the radius of curvature and f is the Coriolis parameter. In a bending channel, the density interface is flat when RoR ∼-1, and Coriolis forces start to shift the velocity maximum when |RoW|<5. We review recent experimental and field observations and describe how Coriolis forces could lead to straighter channels at high latitudes. © 2013 The Author(s) Published by the Royal Society. All rights reserved.

Item Details

Item Type:Refereed Article
Keywords:Channel-levee systems; Coriolis forces; Erosion and deposition; Gravity currents; Turbidity currents; Coriolis parameter; Erosion and deposition; Field observations; Gravity currents; Northern latitudes; Radius of curvature; Sedimentary structure
Research Division:Engineering
Research Group:Maritime Engineering
Research Field:Marine Engineering
Objective Division:Transport
Objective Group:Water Transport
Objective Field:Water Transport not elsewhere classified
Author:Cossu, R (Dr Remo Cossu)
ID Code:94972
Year Published:2013
Web of Science® Times Cited:5
Deposited By:NC Maritime Engineering and Hydrodynamics
Deposited On:2014-09-22
Last Modified:2014-10-16
Downloads:0

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